Pressure cooker gauges can be tested at the Extension Office for free. It is recommended to test pressure cooker gauges once a year. 

The National Center for Home Food Preservation provides excellent research-based recommendations for most methods of home food preservation.

The University of Nebraska - Lincoln

Parts for Pressure Cookers - If new parts are no longer made, the canner is no longer considered safe, and we recommend the pressure canner be taken out of commission. 

Storing Fruits and Vegetables from Washington State University. This excellent guide provides tips for storing fruits and vegetables in and around the house for optimum shelf life.